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Calculating NO2 emissions
I'm interested in an indicator that calculates the proportion of NO2 emitted by traffic that is sequestered by urban green. I found some interesting papers that provided tones of NO2 sequestered by ha and year of urban green (mainly urban forests).
Therefore, I need to calculate the emissions of traffic. The NO2 overlay provides annual average concentrations which cannot be used in mentioned indicator. I know I can calculate emissions using next formula from your model:
E = N [(1-FS)((1-(fm+fz+fb))El + fm Em + fz * Ez + fb * Eb) + FS * ((1-(fm + fz + fb)) * El,d + Fm * Em,d + fz * Ez,d+fb*Eb,d)]*1000/(24*3600)
However, I cannot figure it out how to calculate the length of roads since they are polygons. Is there a way to know the width of roads so then I could calculate the length?